She Inherited Her Father’s $400,000 401(k). One Direct Rollover Turned It Into a Roth She’ll Never Owe Tax On Again, a Door That’s Locked Shut If He’d Left the Money in an IRA

Non-spouse heirs can roll an inherited 401(k) directly into an inherited Roth IRA, pay tax once, and never owe taxes on that account again.

If the original owner moves the money to a traditional IRA before death, this conversion right vanishes permanently. No non-spouse can convert an inherited IRA to a Roth.

Converting a $400,000 balance in one year can spike your tax bracket and trigger loss of ACA subsidies, IRMAA surcharges, and the conversion is irrevocable.

If your father, mother, or any non-spouse relative names you as the beneficiary on a workplace 401(k), you have a one-time escape hatch the tax code refuses to give you if that money is in an IRA when they die. You can roll an inherited 401(k) straight into an inherited Roth IRA, pay income tax once, and never owe another dollar of tax on that account for the rest of your life. This inherited 401(k) to Roth conversion is legal, mandatory for the plan to honor, and almost never mentioned by the administrator handing you the distribution paperwork.

Picture the daughter who inherits her father's $400,000 401(k). Instead of accepting the default nudge into a traditional inherited IRA, she instructs the plan to send the balance as a direct rollover into an inherited Roth IRA titled in her name as beneficiary.

She owes ordinary income tax on the $400,000 in the conversion year. After that, the account grows tax-free, and every qualified withdrawal comes out tax-free. Had her father moved that same money to a traditional IRA a week before he died, this door would be welded shut. Non-spouse heirs cannot convert an inherited traditional IRA to a Roth. Only a surviving spouse can.

The authority is Internal Revenue Code §402(c)(11), added by the Pension Protection Act of 2006, and IRS Notice 2008-30, which clarified that a non-spouse designated beneficiary may direct the trustee of a qualified plan to transfer the death benefit into an inherited Roth IRA.

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The Worker, Retiree, and Employer Recovery Act of 2008 made those direct rollovers mandatory for plans, so the administrator cannot refuse. Nowhere in the Internal Revenue Code does a non-spouse get the same conversion right on an inherited traditional IRA. As Clark Howard put it, "the tax code hates them or hates the people who inherit the money and takes a lot of it in tax."